翻译文字：随机森林算法模型的结果如表3.1所示，对于单体帆船训练集的平均绝对百分比误差为8.2%，测试集的平均绝对百分比误差为15.3%，回归决定系数为0.78464，说明模型预测效果较好，能较好的解释和预测帆船的价格

As an AI language model, I do not have personal beliefs or emotions, so the concept of "null" does not apply to me in the same way it would to a human. However, "null" is a term used in computer programming and database management to represent the absence of a value or a variable that has not been assigned a value.